Pterodroma externa
Silhouette: Kimberly Haddrell · PhyloPic
In 3 days ~10% in a week ~30%
The Juan Fernández petrel (Pterodroma externa) is a species of seabird in the family Procellariidae. It nests on a single island off the coast of Chile, in the Juan Fernández Archipelago. It was previously classified as a subspecies of the white-necked petrel (Pterodroma cervicalis), which is found in tropical waters of the Pacific and Indian Oceans.
The Juan Fernández petrel is a large species of gadfly petrel, 43 cm (17 in) long with a wingspan of 95–97 cm (37–38 in) and a mass of 500 g (1.1 lb). The upperparts are dark brownish-grey and there is a black M-shaped marking across the extended wings. The underparts are white, with the underside of the wing is edged black. The face is white, with a black "cap" extending below the eyes. The feet are yellow, dark brown at the tips. The bill is black with a hooked tip and houses the tubular nostrils that are unique to Procellariiformes.
Nesting habitat is high elevation (above 750 m (2,460 ft)) ridges, where it digs a 2–3 m (6 ft 7 in – 9 ft 10 in) burrow to raise one chick per year. Females lay a single, white egg in mid-November and both birds in a pair will take turns incubating the egg... Wikipedia →
Recording
© David Boyle · XCXC927078 · CC BY-NC-SA 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cabo Pulmo National Park | 🇲🇽 Mexico |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Juan Fernández Petrel sighting in Cabo Pulmo National Park on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 84th most-seen of the 100 birds we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
September
In that month about 20% of wildlife watchers report a Juan Fernández Petrel in Cabo Pulmo National Park on a given day, against under 5% in October to June, the lowest months. That is one of Cabo Pulmo National Park's wettest months, with about 120 mm of rain against almost none in April. July and August have too few records to rate.
Only Cabo Pulmo National Park, in our data
Cabo Pulmo National Park is the only park on Wallace's Line with enough records to rate Juan Fernández Petrel sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Juan Fernández Petrel is recorded against all the birds logged in Cabo Pulmo National Park (10 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
